/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.phoenix.monitoring;

import java.util.concurrent.atomic.AtomicLong;

public class PhoenixTableMetricImpl implements PhoenixTableMetric {

    private AtomicLong numberOfSamples = new AtomicLong(0);
    private Metric metric;

    /**
     * Default implementation used when TableLevel Metrics are enabled
     */
    public PhoenixTableMetricImpl(MetricType type) {
        this.metric = new AtomicMetric(type);
    }

    /**
     * Reset the internal state. Typically called after metric information has been collected and a new phase of
     * collection is being requested for the next interval.
     */
    @Override public void reset() {
        metric.reset();
        numberOfSamples.set(0);
    }

    @Override public long getNumberOfSamples() {
        return numberOfSamples.get();
    }

    @Override public long getTotalSum() {
        return metric.getValue();
    }

    @Override public void change(long delta) {
        metric.change(delta);
        numberOfSamples.incrementAndGet();
    }

    @Override public void increment() {
        metric.increment();
        numberOfSamples.incrementAndGet();
    }

    @Override public MetricType getMetricType() {
        return metric.getMetricType();
    }

    @Override public long getValue() {
        return metric.getValue();
    }

    @Override public String getCurrentMetricState() {
        return metric.getCurrentMetricState() + ", Number of samples: " + numberOfSamples.get();
    }

    @Override public void decrement() {
        metric.decrement();
        numberOfSamples.incrementAndGet();
    }
}
